Electric writing-telegraph.



E. H. & K. A..WIDEGREN.

ELECTRIC WRITING TELEGRAPH.

APPLICATION FILED DEC. 20, 1913.

1 106362; Patented Aug. ILIQM I "HP nirnn stains PATENT onnion.

EIVIIL HENRIK WIDEGR-EN AND KLAS AUGUST WIDEGR'EN, OF ALBY, SWEDEN.

ELECTRIC WRITING-TELEGRAPH.

Specification of Letters Patent.

Patented Aug. 11,1911.

T0 aZZ whom it may concern Be it known that we, EMIL HENRIK ion- GREN and KLAs AUGUST WIDEGREN, subjects of the Kingdom of Sweden, and both residents of Alby, $weden, have inventednew and useful Improvements in Electic riting-Telegraphs, of which the following is a specification.

The present invention relates to electric writing telegraphs in which, for transmit ting the writing, there is used alternating current or pulsating current obtained from a source of continuous current effecting the movements of the recording pen of the receiving apparatus by means of suitable electro'magnetic devices. In such apparatus it has been cliflicult to attain sufiicient damping of the electromagnetic device of the receiver for preventingthe latter from being influenced by the different variations or pulsations of the open current and having it,

to operate only on account of the virtual value of said current, as is necessary in systems of the present class'for attaining an The even writing free from vibrations. present invention relates to improved means for obviating said inconvenience by a mechanical device rendering the recording pen practicaly independent of vibrations which may occur in the electromagnetic device effecting the movements of the said recording pen, so that an even writing identical with the writing put down in the transmitter is obtained in the receiver.

The invention is based on the observation that a spring fastened at the one end but for the rest freely movable, when being put into vibrations proceeding from the point of fastening, Will obtain a node of vibration in a point at some distance from the free end of the spring. This observation is utilized in such manner that, for transmitting the movement from the vibrating electromagnetic device to the recording pen, a

spring of the'said kind is used, the move ment being transmitted to the recording pen from the pointof the spring in which the node of vibration is formed whenthe spring vibrates.

The invention is illustrated in the accompanying drawing in which- Figure 1 displays the principle of the movement transmitting device used according to the invention, and Fig. 2, diagram- 'p'ulsations.

matically, the application ,Of the invention in a writing telegraph of the kind described in our U. S. A Patent'No. 1054811.

Referring to Fig. 2, 1 and 2 designate two long-distance lines through which the electric pulsations transmitting the writing are conducted to the diaphragm relays 3 and 41 of the receiver, eachot' said relays breaking and closing a local circuit 5, 6 and 7, 8 respectively in accordance with the arriving Said local circuits are shunted to other local circuits 9, 10 and 11, 12 re spectively containing a continuous current source 13 and theoscillating coils 1 1 and 15 respectively of the electromagnetic devices of thereceiver which devices are arranged according to the well known principle of the electrometer, the recording pen of the apparatus being acted upon by said electromagnetic devices with the aid of the arms 17 and 1.8 rigidly secured to the oscillating coils, and the rods 19 and 20. When the diaphragm relays 3 and 4 in rapid succession close and break their contacts 21 and 22 respectively, the oscillating coils become alternately short circuited and energized, so that through them passes a pulsating current having a number of pulsations corresponding to the number of pulsations of the current flowing through the long dis tance lines 1 and 2, resulting in that the oscillating coils easily obtain a vibrating movement which, if transmitted to the recording pen, would exert an unfavorable action on the distinctness of the writing. According to the present invention the said inconvenience is obviated by the rods 19 and 20 not being connected directly to the spring and being preferably movable along' the spring thus permittin adjustability of the place in which the node of vibration of the spring is formed so that said node may coincide as nearly as'possible. with the point 25, which may hardly be made adjustable.

It stands to reason that the invention is not limited to the formshown on the drawing but may be applied to writing telegraphs of any kind in which notdesirable vibrations may occur on account of the nature of the currents used for transmitting the Writing.

Having now described our invention, What We claim as new and desire to secure by Let ters Patent is: a

1. In electric Writing telegraphs, the combination of a recording pen, oscillating electromagnetic devices, a spring attached to each of said electromagnetic devices, and means connecting the recording penwith said springs at a point thereof coinciding with a node of vibration, substantially as and for the purpose set forth.

2. In electric writing telegraphs, the, combination of a recording pen, oscillating electromagnetic devices, a spring attached to each of said electromagnetic devices, means connecting the recording pen with said springs at a point thereof coinciding with a node of vibration, and a Weight attached adjustably to each spring, substantially as and for the purpose set forth.

In testimcny'that we claim the foregoing as our invcntion,,we have signed our names in presence of two subscribing Witnesses.

EMIL HENRIK WIDEGREN. KLAS AUGUST WIDEGREN; Witnesses:

CONRAD NERM, HILDEN HZKANsoN. 

